Eccentric.



PATENTED MAY 26, 1903.

UNITED STATE i'afentea May '26, 1903; TPATENT OFFICE.

JOHN WESLY DAVIS, OF SAISBURY, NORTH CAROLINA.

EcoENTRlc.

SPECIFIGATION forming' part lof Letters Patent No; 729,287, d'ated Ma 26, 1903.

w Application filedlE'ebruary 14, 190 3. Serial No. 143,280; (No model.)

T0 all whom, it nuty cmwern:

Be it known that I, JOHN WEsLEY DAVIs, a citizen of the United States, and a resident of Salisbury, in the county of Rowan and State of North Carolina, have invented a new and Imp'roved Eccentric, of which the following is a full, clear, andr exact description.

This invention relates to an eccentric adapted especially for use on locmotives to operate the valve-gear thereof.

The object of the invention is to'construct the eccentric so that it may be fastened to the axle or shaft more securely than heretofore.

In the modern locomotive the strains to which the eccentric is subjected are so destructive that as ordinarily arranged the eccentrics frequently become loose o n the shaft and necessitate extensive repairs. My invention seeks to overcome this disadvantage.

This specification is an exact description of one example of myinvention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters `of reference indicate corresponding parts in all the views.

Figure 1 is a faceview of the eccentric. Fig. 2 is a section on the line 2 2 of Fig. 1, and Fig. 3 is a section on .the line 3 3 of Fig. 1.

The eccentric comprises three parts,namely, a body a, a crown-piece b, and a key-piece o. The body a is formed with an opening a', which extends outward from the opening a2 for the shaft to the periphery of thev eccentric, such opening ot' extending across the wide portion or largest radius of the eccentrio. This opening a' is formed with a contracted outer portion G3, producing shoulders a4 at each side, these Shoulders being undercut, as illustrated. The crown -piece b'is seated in the outer portion'of the opening a' and has its outer edge curved to form a continuationof the periphery of the eccentric. At each side edge the crown-piece is enlarged,

as indicated at b', thus forming portions which match With the enlarged or main portion of the opening a' and lock against the undercut Shoulders a4. The key-piece c is of a width equal to the diameter of the shaftopening and has its inner edge c/curved to form a continuation of the curve of the opening a2 in the body-piece, these edges 01' openings a2 and c" jointly forming the opening foi' the shaft-on which the eccentric is mounted. The key-piece c is /also formed'in its edge o' with a seatc2 for-aspline or feath-er to bo used in the usual manner. The adjoining cdges of the parts b and c should be matched together in the manner shown or in any other convenient or desired form. It will be observed from Fig. 1 that the lower side portions of the key-piece c are separated slightly from theadjoining walls of the opening a' in the body-piece, thus allowing the key-piece a slght movement toward and from the center of the shaft on which the eccentric is mounted. The crown piece b is not, however, adapted to have any movement relative to the body-piece, the Shoulders a' preventing out- Ward, movement (the tendency to which is greater than to inward'movement) and bolts d prevent 'inward movement. These bolts are passed through matching cavities formed in the adjoining walls of the sections a and b, as illustrated best in Eig. 2.

e indicates tapered keys which are seated in matching cavities formed in the adjoining edges of the Sections b and o and which may be held in place by any desired meansfor example, by the nuts e', threaded on the small ends of the keys, as shown.

In applying the eccentric the parts are fitted around the shaft, and then the keys e are applied and forced tightly in position, this action driving the key-piece c down tightly on the shaft and at the same time causing the walls of the opening 0,2 in the body-piece to be drawn up against the shaft with an equal pressure. By this construction the eccentric clamps the shaft tightly at all points around the shaft, and the eccentric is held in place by a pressure that.is equally distributed, as

contradistinguished from the action of a setscrew as ordinarily employed to tend to "draw the eccentric away from one side of the shaft. After the keys e have been tightened np into place a key of the usual sort may be driven into the seat 02.

Various changes in the form and details of my invention may be resorted to at will without departing from the spirit of my invention. Hence I consider myself entitled to all forms of the invention as may lie within the intent of my claims.

I-Iaving thus described my invention, I claim as new and desire to secure by Letters Patent- 1. An eccentric having a circular periphery and an eccentric shaft-opening and comprising a body-piece having an opening extending outward from the shaft-opening to the periphery of the body-piece, a crown-piece held firmly in the outer part of said opening, a key-piece movably placed in the inner part of said opening inward of the Crown-piece, and means for forcing the key-piece away from the Crown-piece.

2. An eccentrie, having parts forming its outer or peripheral portion and a key-piece movably placed thereon, said key-piece having a cnrved inner edge forming part of the shaft-opening of the eocentric, and the keypiece being of a width equal to the diameter of the shaft-opening, and means for forcing the key-piece inward toward the center of the shaft-opening.

3. An eecentric having.r a eircular periphery and an eccentrie shaft-opening and eomprislng a body-piece with an opening extending ontward from the shaft-opening to the periphery of the body-piece, the outer part of said opening being contraeted to form shoulders, a Crown-piece placed in the outer part of said opening and held by the shoulders, a key-piece placed inward of the Crown-piece in the inner part of said opening of the bodypiece, and means for foreing the key-piece toward the center of the shaft-opening.

4. An eccentric having a eircular periphery and an eecentrie shaft-opening and eomprising a body-piece with an opening extending outward from the shaft-opening to the periphery of the body-piece, the outer part of said opening being contracted to form shoulders, a erown-piece placed in the outer part of said opening and held by the Shoulders, a key-piece placed inward of the crown-piece in the inner part of said opening of the bodypiece, and means for forcing the key-piece toward the center of the shaft-opening, said means comprising a tapered key driven between the adjaeent edges of the Crown and key pieces.

5. An eccentri havingacircularperiphery and an eocentric shaft-opening and eomprising a body-piece having an opening extending ontward from the shaft-opening to the periphery of the body-piece, a Crown-piece held firmly in the outer part of said opening, a key-piece movably placed in the inner part of said opening inward of the crown-piece, and means for forcing the key-piece away from the crown-piece, said means comprising a tapered key driven in between the meeting edges of the Crown and key pieces.

6. An eccentric, comprising a body-piece with an opening extending outward from the shaft-opening to the periphery of the eccentrio, the onter portion of said opening being contraoted to form shoulders, a crown-piece placed in the outer portion of the opening and having an enlarged inner portion bearing against the said Shoulders of the bodypiece, a bolt fitted between the crown-piece and body-piece to prevent the inward movement of the former, a key-piece set in the inner part of the opening in the body-piece and movable relatively to the bodypiece, and means for forcing the key-piece inward toward the center of the shaft-opening.

7. An ecoentrie, comprising a body-piece with an opening extending outward from the shaft-opening to the periphery ot' the eccentric, the outer portion of said opening being contracted to form Shoulders, a Crown-piece placed in the outer porlion of the opening and having an enlarged inner portion bearing against the said Shoulders of the body-piece, a bolt fitted between the orown-piece and body-piece to prevent the inward movement of the former, a key-piece set in the inner part of the opening` in the body-piece and movable relatively to the body-piece, and means for foreing'the key-piece inward toward the center of the shaft-opening, said means eomprisinga tapered key driven in between the meeting edges of the crown and key pieces.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN WESLEY DAVIS.

\Vitnesses:

L. D. HAoKEr'r, B. M. MARsH. 

